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MODEL 821 UNREGULATED RACK POWER SUPPLY

Description

The Model 821 is an external power source for most signal conditioning instrumentation.
It features a shielded toroidal power transformer, load-monitor meters for all
outputs and power for two racks of most types of instrumentation. It provides four
floating and regulated DC output voltages. Two 15V outputs are typically connected
as a dual voltage source suitable for amplifier modules while the 5V output is typically
used for TTL logic. A 24V output can be connected as a negative voltage source for
eddy-current probes or as a positive compliance voltage for constant-current circuit
such as required for charge converters. Any output voltages can be reduced, i.e.,
15V to 12V with an internal resistor change.

Specifications

Input power: Voltage card insert selects 115V ±15% or 230V +15% input line

Current: 1.8A RMS max. @115V input;

                      0.9A RMS max. @230V input
                      Line fuse: 2A, 3AG Slo-Blo @115V;
                    1A, 3AG Slo-Blo @230V

Regulated outputs: Four voltages, all floating with respect to power supply common and ground,
allowing any jumper-selected combination of polarities

Typical configuration: Dual ±15VDC @2A
Single +5VDC @2A
Single +24VDC @0.5A

Regulation: ±0.1% typical line and load

Ripple: Less than 10mV pk to pk

Output connections: 10mV pk to pk
Five-way banana jacks with integral shorting links

Operating temperature: 0°C to 50°C

Front panel load meters: Three each 0-3 ADC for 15V and 5V outputs and one each 0-1 ADC for the 24V output

Mechanical: Rack mounted, 3 1/2”H x 19”W x 14”D

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